LLMs are very good at creating things in the style of existing work, but they aren't that great at re-creating existing work verbatim. For example, here's what happens if you prompt Midjourney to draw "the mona lisa": https://i.imgur.com/njOlL5h.jpg

Obviously these are attempts at recreating the Mona Lisa, but none of them are the Mona Lisa. Whether they fall within fair use is an entirely separate question.